package com.changgou.system.filter;

import com.changgou.system.util.JwtUtil;

import io.jsonwebtoken.Claims;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import javax.xml.transform.Result;

@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        // 如果访问的路径是登录，则放行
        if (request.getURI().getPath().contains("/admin/login")) {
            System.out.println("用户执行登录...");
            return chain.filter(exchange);
        }

        HttpHeaders headers = request.getHeaders();
        String token = headers.getFirst("token");

        // 如果令牌为null,返回错误状态码
        if (StringUtils.isEmpty(token)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            System.out.println("没有通过令牌验证");
            return response.setComplete();
        }

        try {
            Claims claims = JwtUtil.parseJWT(token);
            System.out.println(claims.toString());

        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("没有通过令牌验证");
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        System.out.println("通过令牌验证");
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
